The nine children, all aged about 11, are at three Perth schools including six at Scotch College, two at Christ Church Grammar School and one at East Claremont primary school, all in Perth’s affluent western suburbs.

“We’re now working with schools to discuss the best course forward,” Dr Effler said.

“We’re recommending partial closure or in the case of a small school closure for a limited time.”

Scotch College acting headmaster Peter Freitag said about 200 students in years six and seven would stay home this week.

“We’ve been advised to go for a week,” Mr Freitag said.

No one infected with the virus in WA has been hospitalised and all were on their way to a full recovery from the virus, Mr Effler said.